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Update documentation to state there is three-value logic, not

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three-value boolean logic.

Backpatch to 9.0.X since we just got another bug report about this
today.
This commit is contained in:
Bruce Momjian 2011-05-09 21:04:22 -04:00
parent 65a7cd0e9c
commit f71b5c77fa
1 changed files with 3 additions and 2 deletions
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doc/src/sgml/func.sgml
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@ -82,8 +82,9 @@
<member><literal>NOT</></member>
</simplelist>
<acronym>SQL</acronym> uses a three-valued Boolean logic where the null value represents
<quote>unknown</quote>. Observe the following truth tables:
<acronym>SQL</acronym> uses a three-valued logic system with true,
false, and <literal>null</>, which represents <quote>unknown</quote>.
Observe the following truth tables:
<informaltable>
<tgroup cols="4">